become part of 和 become a part of这两个词组都对吧?

问题描述:

become part of 和 become a part of这两个词组都对吧?
没有become parts

都对的.become parts of 也对的
看下面的三个新闻标题
Haikou and Sanya (become parts of) China National Traveling Route
S. Ossetian Denies Plans to (Become Part of) Russia